ML19338F729
| ML19338F729 | |
| Person / Time | |
|---|---|
| Site: | 07001092 |
| Issue date: | 09/05/1980 |
| From: | Hahn H, Mueller J EG&G, INC. |
| To: | |
| Shared Package | |
| ML19338F727 | List: |
| References | |
| WAMD-011, WAMD-11, NUDOCS 8010270115 | |
| Download: ML19338F729 (4) | |
Text
. _ _ _ -
WAMD - 011 September 5, 1980 T1 EGsG hN Energy Measurements Group
SUMMARY
REPORT THE AERIAL RADIOLOGIC SURVEY OF THE UNITED NUCLEAR FACILITY AT NUCLEAR LAKE NEAR PAWLING, NEW YORK DATE OF SURVEY:
MAY 1980 APPROVED FOR PUBLICATION 4
J. Rober' Mueller,/EGSG, Inc.
d _. n. 41, k u /
HeFber't F. Hahn, Depa'rtment of Energy PERFORMED BY EGSG, INC. UNDER CONTRACT NO. DE-AM-80-76NV0ll83 WITH THE UNITED STATES DEPARTMENT OF ENERGY 8010270//5
The Aerial Measureme'e-System operated by EGr,G, Inc., for the United States Department of Energy, was used te conduct an Aerial Radiologic Survey over the decomissioned United Nuclear Corporation facility near Pawling, New York, in May 1980. The purpose of this survey was to establish if dny fixed gamma photon emitting material (s) was present at this site and if so, to affect precise location and quantification of such material (s).
To this end, a Boeing 105 helicopter, fitted with gamma radiation detec-tion equipment, was flown in routinely employed, standard operative l
manner (in re, height, speed, navigational parameters, etc.' over the area shown in the attached Figure.
i For this particular survey, two distinct operative modes of gamma detection were employed; Mode I (M,) -- high energy (50 KEV-3000 KEV) and Mode 11 (M,,) -- low energy (12 KEV-300-KEV).
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region of energy where most man-made gamma emitting radionuclides would normally be detected.
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represents that energy region where gama radiation indicative of most transuranic activity would be detected.
Since Plutonium activity was the major activity of interest, an indirect method of detection was necessary.
Plutonium is primarily an alpha (a) emitter; thus direct detection and quantification with the airborne system used was not feasible.
Therefore, the M,, mode was utilized in an effort to detect Americium.,a gamma photon emitting daughter product
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of the Plutonium activity.
Furthermore, an effort was made to enhance the detectability of low energy gamma emitting radicactivity by having the helicopter hover over the formerly used labcratory buildings near the lake.
This was done to increase the counting time over the locations most likely to be the site of a possible radioactive source, thus increasing the probability of detection.
In analyzing the gamma radiation activity data thus obtained, normal environmental (natural background) gamma radiation was subtracted rendering an accurate assay of any fixed gamma radioactivi ty.
Preliminary analyses of collected data clearly indicate that no man-made gamma photon activity (M,) above normal environmental background levels was detected. Additionally, the airborne system employed detected no evidence of transuranic ctivity (M,;).
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